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Method for wavefield-based data processing including utilizing multiples to determine subsurface characteristics of a subsurface region

A technology of underground area and processing method, which is applied in the field of geophysical exploration, can solve the problem of false events in the output image, and achieve the effect of avoiding artifacts

Inactive Publication Date: 2012-04-11
CHEVROU USA INC
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the presence of free-surface correlated multiples, state-of-the-art RTM methods can produce spurious events in the output image due to an imperfect data observation system (Mittet, 2002)

Method used

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  • Method for wavefield-based data processing including utilizing multiples to determine subsurface characteristics of a subsurface region
  • Method for wavefield-based data processing including utilizing multiples to determine subsurface characteristics of a subsurface region
  • Method for wavefield-based data processing including utilizing multiples to determine subsurface characteristics of a subsurface region

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Embodiment Construction

[0025] figure 1 Flowchart 10 illustrates one embodiment of the invention. This embodiment includes a wavefield-based data processing method that includes utilizing multiples to obtain properties of a subsurface region of interest. The method includes obtaining an earth model and a migration model 12 related to the subsurface region of interest. The method further includes determining, for the earth model and for the migration model, a simulated geometry 14 associated with the subsurface region of interest, and forward propagating at least one wavefield 16 in the earth model from at least one excitation source obtained from the simulated geometry . The method also includes forward propagating at least one wavefield 18 in the migration model from the same source obtained from the simulated geometry, and backpropagating in the earth model using at least one receiver position obtained from the simulated geometry At least one wave field 20. The method additionally includes dete...

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Abstract

Despite full waveform propagation capabilities offered by reverse time migration or inversion, prior art methods can generate spurious events from multiples and therefore are limited to using data without free-surface multiples. By eliminating or largely reducing artificial transmission of multiples, the enhanced reverse time migration or inversion in the present invention can correctly use data that contain free-surface and internal multiples and improve image quality or properties estimation.

Description

technical field [0001] The present invention relates generally to geophysical exploration, and more particularly to seismic data migration and inversion methods that use multiple reflections in seismic signals or data to obtain properties of subsurface regions of interest. Background technique [0002] Reverse time migration (RTM, reverse time migration) has been applied to image complex structures for oil and gas exploration and development. In contrast to state-of-the-art unidirectional imaging methods, state-of-the-art RTM is based on solving bidirectional wave equations and is able to propagate wavefields in all directions. RTM also accurately maintains the propagation amplitude. These advantages over unidirectional imaging often result in significantly improved images of complex structures, especially when using wide-azimuth data. [0003] Current practice for RTM is still limited to using data with free surface multiples removed. In this way, in contrast to unidirec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G06T17/05
CPCG01V1/28G01V2210/51G01V2210/56G01V2210/679
Inventor 刘伟
Owner CHEVROU USA INC
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